【摘要】：目前,管道泄漏檢測技術(shù)種類繁多,其中聲波泄漏檢測技術(shù)因其自身優(yōu)點(diǎn),得到了廣泛應(yīng)用。然而由于氣體在輸送過程中處于紊流狀態(tài),且聲波信號能傳播至相鄰管段等原因,實(shí)測聲波信號中包含諸多干擾,泄漏檢測系統(tǒng)仍存在較多漏報(bào)、誤報(bào)現(xiàn)象。為有效提高聲波泄漏檢測系統(tǒng)的檢測可靠性以及定位精確性,減少漏報(bào)、誤報(bào),針對聲波信號極易受到強(qiáng)低頻干擾影響的特點(diǎn),提出了聲波信號延時(shí)差分處理方法,分析了不同延時(shí)差分步長對于聲波信號特征提取的影響,得到了延時(shí)差分步長的選取準(zhǔn)則。詳細(xì)推導(dǎo)并分析了干擾信號對互相關(guān)系數(shù)曲線峰值位置的影響,采用信號分離、匹配定位的方法,有效分離了來自站點(diǎn)、相鄰管段的干擾信號與泄漏信號,提高了單管段泄漏定位準(zhǔn)確性。針對多站點(diǎn)長距離氣體輸送管道,仿真產(chǎn)生了極易造成重復(fù)報(bào)警、誤報(bào)的異常信號,分析了相鄰管段之間異常信號的傳播關(guān)系,提出了異常信號溯源與延遲報(bào)警相結(jié)合的多站點(diǎn)長距離氣體輸送管道泄漏定位方法。實(shí)測信號測試結(jié)果表明,基于延時(shí)差分處理的異常信號診斷、匹配定位方法有效提高了泄漏診斷的可靠性及定位精確性,結(jié)合異常信號溯源及延遲報(bào)警方法,減少了長距離氣體輸送管道泄漏監(jiān)測系統(tǒng)漏報(bào)、誤報(bào)的發(fā)生。
[Abstract]:At present, there are many kinds of pipeline leak detection technology, among which acoustic leak detection technology has been widely used because of its own advantages. However, because the gas is in turbulent state in the process of transportation, and the acoustic signal can propagate to the adjacent pipe section and so on, there are many disturbances in the measured acoustic wave signal, and there are still many false positives and false positives in the leak detection system. In order to improve the detection reliability and positioning accuracy of acoustic leakage detection system effectively, and to reduce the false alarm and false alarm, a delay differential processing method for acoustic wave signal is put forward in view of the characteristic that acoustic signal is easily affected by strong low frequency interference. The influence of different delay differential step size on the feature extraction of acoustic signal is analyzed, and the criterion of selecting delay differential step size is obtained. The influence of interference signal on the peak position of correlation curve is deduced and analyzed in detail. The method of signal separation and matching location is used to effectively separate the interference signal from adjacent pipe segment and the leakage signal. The accuracy of single tube leakage location is improved. In view of the long distance gas transmission pipeline at many stations, the abnormal signal which is easy to cause repeated alarm and false alarm is generated by simulation, and the propagation relationship of abnormal signal between adjacent pipe segments is analyzed. A multi-station long distance gas pipeline leakage location method combined with abnormal signal tracing and delay alarm is proposed. The test results of the measured signals show that the matching localization method can effectively improve the reliability and accuracy of the leak diagnosis based on delay differential processing, combined with the abnormal signal tracing and delay warning method. The leakage monitoring system of long distance gas pipeline is reduced.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE973.6

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本文編號：2415820